The greatest detrimental effect on idle electrical equipment, such as cargo pump motors, is the（）.<br>A:loss of residual magnetism<br>B:absorption of moisture in the insulation<br>C:insulation varnish flaking<br>D:dirt collecting on the windings

The greatest detrimental effect on idle electrical equipment, such as cargo pump motors, is the（）.
A:loss of residual magnetism
B:absorption of moisture in the insulation
C:insulation varnish flaking
D:dirt collecting on the windings

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